The default IEEE 802.1x AP authentication configuration on a Cisco Catalyst 9800 Series Wireless Controller is EAP-FAST with CAPWAP DTLS (Option D). This method uses EAP-FAST for authentication within a secure tunnel established by Datagram Transport Layer Security (DTLS) over CAPWAP, which provides both security for authentication credentials and encryption for wireless management frames. References := ( CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide )
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